Hi N. Horner and welcome. I found this for you, hope it helps;
Traps are probably one of the most traditional ways of catching mice. There are many kinds of traps, from snap devices to cage setups. Although it requires more cunning than using mothballs, trap setting can eradicate the mouse problem without having adverse effects on a person's health. There are also other anti-rodent mechanisms such as electronic audio devices that emit an irritating, high-pitched sound and scare mice off.
Herbs and Other Home Remedies
It is hard for natural elements to process naphthalene moth balls, making them hazards for the environment. There are more earth-friendly solutions to rodent problems, and most of these can be found around the house. Herbs, plants, and extracts such as mint, bay leaves, and peppermint oil are only some of the home remedies for this pest issue.
Combination
These techniques are not exclusive of each other --- in fact, they will work best when employed together. As with any other pest trouble, dealing with mice takes effort and patience.